I used the Super as my dedicated 4 way, it worked okay but I really didn't see too much difference between it and the other 8 way Happ sticks (Competitions I think). I had the SlikStik blue illuminated handle on it so that drew all of my friends to want to use it.
I upgraded to the reunion stick about a month ago and it has EXACTLY the same base so mounting was EXACTLY the same as the Super. Also, the SlikStik handle fit exactly the same way (which makes sense because it's the same base on both sticks.
The difference is the restrictor plate. I think the acuator is exactly the same size. I held them end to end and couldn't see or feel any difference in the diameter. This was obviously when I compared the 4 way side vs. the reunion.
I think the price difference between the Super and the Reunion is only about $5 and I highy recommend getting the Reunion. I do notice a big difference in play because of the restrictor plate. If you're going with a dedicated 4 way stick don't get the Super.